Nervous I'm pregnant again...

Meg
So I've had 2 pregnancies and 2 miscarriages, beginning of September at 5 weeks, and again beginning of December at 7 weeks... My husband and I have been ttc since we were married in April 2015. Since its unusual for 2 young healthy people to have 2 MC in a row, my OB is running a full fertility panel on me, like soooooo many tests, and I'm supposed to get a hysterosalpingogram (X-ray of my uterus/ Fallopian tubes) right after I get my first AF after the MC. We are supposed to wait to try, and use protection, until after all these tests are back (at least another 6 weeks), however we got frisky a few weeks ago and had sex without condom (only 7days after mc, NOT in my fertile window)... It was literally the ONLY time we had sex in the month of December (having fun doing other things to prevent pregnancy!). With my first (only) 2 pregnancies, my very first early sign was sore breasts (like clockwork, I knew both times!). This morning I've been nauseous, and all of a sudden my breasts hurt (and they don't normally hurt before AF)... Could I be pregnant? And if so, is this going to be really bad if/ that it happened? Anyone else have a similar situation? Thanks!